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tweeter

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pete g:
hi all,i need clarification on tweeters. i see piezo tweeters listed as having 8 ohm impedance, do they have a voice coil? i thought they were made with crystals. what is the 8 ohms in reference to?  is it non-piezo tweeters that have 8 0hms resistance?

David_AVD:
Remember that (DC) resistance and (AC) impedance are not the same thing.

coppercone2:
use LCR meter

SiliconWizard:
A piezo tweeter can be basically modeled with a capacitor in series with a resistor. The piezo element is essentially capacitive. The series resistor models the losses.
The impedance of any speaker can only be given as a graph vs. frequency (and even multiple curves, vs. power, but let's keep it simple).

Piezo tweeters typically have a pretty high impedance below their cut-off frequency. The range for which the impedance is more or less constant (it isn't) depends on the specific tweeter, but it's usually something between a few kHz to a few tens of kHz.

They absolutely do not have a voice coil, that's one of their plusses for high frequency response. Basically, it's a piezo element that moves a cone of some sort.

Something to read: https://pispeakers.com/PIE_Speaker_Application_Note.pdf

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